UnderLust! Smut Fanfic

Reader x UnderLust! Sans

You hurried over to the skelebros' house, thinking about the dream you'd just had. Whenever you had dreams, they usually came true. Last night, you'd dreamt Sans calling out your name and you calling back. You needed to make sure everything was alright, for, you've had quite the crush on the older skeletal brother for a while, now. You finally arrived at their house and politely opened the door without knocking. "SANS!" you scream, hoping to actually grab his attention. "GET YOUR LAZY ASS DOWN HERE!". There! That oughta... wait. He's still not coming down.

You mumble to yourself that this better not end up like the fanfictions you're always reading, while going upstairs to knock on Sans' door. *Knock knock* ... Hmm.. No reply. You decide that at this point, you should break down the door, so you do just that! You ram your shoulder into the door, and it opens! Unfortunately, as a result, you end up face-planting onto the floor. You quickly get up, brush yourself off, and look around. You walk over to Sans' bed and peek at him. He's sleeping but.. sobbing at the same time... You can't bear seeing him like this and so you hug him, cradling his skull like a baby.

"Shi.. It's oke. I'm here." you whisper reassurances into his ear canal. He slowly wakes up and looks at you, starting to blush. The purple tint on his cheekbones gets darker and darker, while you start blushing at lord knows what. "(Y-Y/N)..?" It's obvious he's confused, so you explain everything. He stares at you and says "(Y/N), I was having a nightmare." you nod and say "You wanna talk about it?" he reluctantly nods and replies "You were dead.. I don't know when or how, but I had lost you without the chance to do this.."

On "this", he was centimeters away from your face. All of a sudden, he pressed his teeth against your mouth! His hand slid up your shirt, making you gasp in surprise. He pushed you down onto his bed, and slipped his tongue into your mouth. You felt his hand grab your breast and squeeze tightly. Your back arched slightly and Sans moved his mouth down to your neck, where he attacked your neck and collarbone with kisses and small nibbles, trying to find your sweet spot. When he gave up, he simply turned your head to the side, and bit down harshly.

You stifled a moan, but it still came out, muffled. Sans straddles you and looks down at you. "Hmmm" he murmurs, thinking. "What!" you ask him, slightly annoyed at the restriction of movement. "I was just thinking about how much better you would look like this~!" Sans snaps his fingers and your clothes disappear. You shiver and notice he's looking at you with hunger blazing in his eyesockets. You smirk and say "Ya like what ya see?"

Sans leans down close to your ear and whispers "You've got no idea, darling'". Okay. That's it. You are TURNED ON. You grab his face and bring it up really close to yours. "I want you to bone me, daddy~" you say, in the sexiest voice you can muster. Sans softly nibbles on your bottom lip and giggles "I thought you'd never ask~" you see a faint purple glow steadily pulse in Sans' crotch area. He slowly takes off his jacket and shorts, revealing a well-sized Dick. He teases your entrance with his cock.

When you had finally got tired of it, you bucked your hips up, causing his thick junior to enter your core as you let out a moan. You could feel yourself adjusting to Sans. Suddenly, he moved without warning, slamming into you like an uncontrollable animal, groaning as your walls tighten around him. You moan loudly "A-Ah~ Sans! Yes!~" encouraging him to go faster, harder, and begging for more. Sans roughly grabs your breast again, and bites your collarbone fiercely. Sans starts talking between moans "(Y-Y/N) I'm gonna- Aah~" Younod and wrap your legs around his waist, preventing him from pulling out. You realize that you're close, too, and moan louder as you near your orgasm.

Sans yells out your name as he comes "(Y/N)!!". His seed shoots deep inside of you, causing you to come, as well. "SANS!!" you scream. You both collapse onto the bed, when you suddenly remembered your dream and giggled. Sans looks at you questioningly, but doesn't say anything except "I love you~" before falling asleep. You snuggled up next to him and dreamed of tomorrow.